GE L90 Instruction Manual page 426

GROUPED ELEMENTS
Multiplier Current ( I / I
(TDM)
1.5
2.0 2.310
4.0 4.621
6.0 6.931
8.0 9.242
10.0 11.552
IAC Short Inverse
0.5 0.072
1.0 0.143
2.0 0.286
4.0 0.573
6.0 0.859
8.0 1.145
10.0 1.431
2
I t curves
2
The I t curves are derived as follows:
5
where
T = Operate time (in seconds)
TDM = Multiplier setting
I = Input current
I = Pickup Current setting
pickup
T = reset time in seconds (assuming energy capacity is 100% and RESET is "Timed")
RESET
2
Table 5-34: I t curve trip times
Multiplier
(TDM)
0.01
0.10
1.00
10.00
100.00
600.00
5-240
)
pickup
2.0 3.0 4.0
1.499 1.064 0.885
2.997 2.128 1.770
4.496 3.192 2.656
5.995 4.256 3.541
7.494 5.320 4.426
0.047 0.035 0.031
0.095 0.070 0.061
0.190 0.140 0.123
0.379 0.279 0.245
0.569 0.419 0.368
0.759 0.559 0.490
0.948 0.699 0.613
Current ( I / I )
pickup
1.5 2.0 3.0
0.44 0.25 0.11
4.44 2.50 1.11
44.44 25.00 11.11
444.44 250.00 111.11
4444.4 2500.0 1111.1
26666.7 15000.0 6666.7
5.0 6.0 7.0
0.784 0.719 0.674
1.569 1.439 1.348
2.353 2.158 2.022
3.138 2.878 2.695
3.922 3.597 3.369
0.028 0.027 0.026
0.057 0.054 0.052
0.114 0.108 0.105
0.228 0.217 0.210
0.341 0.325 0.314
0.455 0.434 0.419
0.569 0.542 0.524
4.0 5.0 6.0
0.06 0.04 0.03
0.63 0.40 0.28
6.25 4.00 2.78
62.50 40.00 27.78
625.00 400.00 277.78
3750.0 2400.0 1666.7
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
8.0 9.0
0.640 0.614
1.280 1.229
1.921 1.843
2.561 2.457
3.201 3.072
0.026 0.025
0.051 0.050
0.102 0.100
0.204 0.200
0.307 0.301
0.409 0.401
0.511 0.501
7.0 8.0 9.0
0.02 0.02 0.01
0.20 0.16 0.12
2.04 1.56 1.23
20.41 15.63 12.35
204.08 156.25 123.46
1224.5 937.50 740.74
10.0
0.594
1.188
1.781
2.375
2.969
0.025
0.049
0.099
0.197
0.296
0.394
0.493
Eq. 5-18
10.0
0.01
0.10
1.00
10.00
100.00
600.00